Checkout Sessions

Hosted checkout owns quote, approvals, wallet mismatch checks, submit, indexing, redirects, and partner lifecycle callbacks.

Build a launcher →Builder OpenAPI →

Overview Integrations Wallet Auth Checkout Sessions API Keys Webhooks Embeds Metrics

Builder contract

Partner browsers create trade tokens, then checkout sessions. They never send API keys.

Partner servers may create sessions directly with API keys kept server-side.

Widget remains a checkout launcher; transaction signing stays in hosted checkout.

POST /api/builder/v1/checkout/sessions
{
  "publicIntegrationId": "pub_...",
  "tradeToken": "<short-lived token>",
  "chainId": 480,
  "marketAddress": "0x...",
  "tradeType": "buy",
  "side": 0,
  "amountWei": "1000000000000000000",
  "collateralToken": "PRB"
}

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